| Title |
Effects and its Control of Soluble Organic Materials on the Fouling of Microfiltration |
| Authors |
윤상린 ( Yun Sang Lin ) ; 김동하 ( Kim Dong Ha ) ; 지덕기 ( Ji Deog Gi ) ; 이상욱 ( Lee Sang Ug ) |
| Keywords |
membrane fouling; FOC; particle size distribution; PAC; coagulant |
| Abstract |
The coupling of an activated sludge reactor with a membrane unit (Membrane Bioreactor system) offers several advantages over conventional process. But the major disadvantage of this process in the extensive use is the continuous reduction of permeation flux caused by membrane fouling. The aim of this study is to investigate membrane fouling characteristics caused by the soluble organic materials in the membrane bioreactor System process. For the removal of the filterable organic materiais(FOC) less than 1㎛, coagulants and activated carbon were added. Gravity filtration and filtration under the pressure of 206kPa were conducted in the experiments. The rate of filtration flux increased abruptly with the decrease of FOC concentration. The flux with FOC 1.2㎎/l showed the 4.3 times higher compared to the results of FOC 3.7㎎/l. After addition of granular activated carbon (15min) and sedimentation (20min) of raw water 18% of FOC were removed while 54% and 67% of FOC were removed when 400㎎/l and 500㎎/l of PAC were added, respectively. From these results. PAC is superior in the FOC removal than GAC. By the addition of PAC after the coagulation reaction. more than 90% of organic particles less than 0.1㎛ was removed and the flux became 290 times faster than that of no treated water. This study showed that PAC addition after the coagulation reaction is the most elfective process to prevent membrane fouling problems. |